RFP for BHOPAL & Narmadapuram Division - Madhya Pradesh ...

homogenous road segment or three samples for each soil typeencountered, whichever is more.4.9.3.3.3 The testing for subgrade soil shall include:(i) in-situ density and moisture content at each test pit(ii) field CBR using DCP at each test pit(iii) characterisation (grain size and Atterberg limits) at eachtest pit and,(iv) laboratory moisture-density characteristics (modifiedAASHTO compaction);(v) laboratory CBR (unsoak and 4-day soak compacted at threeenergy levels) and swell.4.9.3.3.4 For problematic soils, the testing shall be more rigorous. Thecharacteristics with regard to permeability and consolidation shallalso be determined for these soils. The frequency of sampling andtesting of these soils shall be finalised in consultation with theMPRDC officers after the problematic soil types are identifiedalong the road sections.4.9.4 Investigations for Bridges and Structure4.9.4.1 Inventory of Bridges, Culverts and StructuresThe Consultants shall make an inventory of all the structures(bridges, ROBs, culverts, etc.) along the road under the project. Theinventory for the bridges, and ROBs shall include the parametersrequired as per the guidelines of IRC-SP:35-1990. The inventory ofculverts shall be presented in a tabular form covering relevantphysical and hydraulic parameters4.9.4.2 Hydraulic and Hydrological Investigations4.9.4.2.1 The Consultants shall collect information on high floodlevel (HFL), low water levels (LWL), discharge velocity etc. fromavailable past records, local inquiries and visible signs, if any, onthe structural components and embankments. Local inquiries shallalso be made with regard to the road sections getting overtoppedduring heavy rains.4.9.4.2.2 The Consultants shall make a desk study of available dataon topography (topographic maps, stereoscopic aerialphotography), storm duration, rainfall statistics, top soilcharacteristics, vegetation cover etc. so as to assess the catchmentareas and hydraulic parameters for all existing and proposeddrainage provisions. The findings of the desk study would befurther supplemented and augmented by a reconnaissance alongthe area. All important hydrological features shall be noted duringthis field reconnaissance.ADB-IV45